That laser wouldn't burn all the way through someone, but scale it up to something thousands or millions of times more powerful a-la Kryptonian heat vision and you probably could ablate all the way through a human (or human-ish monster).
Granted, it'd really be closer to "explode" than "ablate" at that point. That's kinda what extremely high power lasers do; if you completely vaporize (technically "subliminate") a person in a fraction of a second, you now have a blob of gas which is extremely hot and has roughly the size and mass of a person.
That is a more polite term for "a massive explosion".
Well Said. As OL described, Mr Kent's got some capital ship grade lasers behind those trendy glasses. I've only personally played with ones in a few watts range, lower end commercial ones are closer to 40 to 50 watts doing paper and wood. Steel cutting lasers are up in the 500 Watt range.
Flipping over to one of the more useful collections of esoteric information in the internets,
Project Rho Useful Tables we can grab a rough idea of how much energy it takes to vaporize a human being, at 3.0 × 10
09 Joules (if you just want dust). Watts = Joules Per Second.
A 100% efficient steel cutting commercial laser at 500 watts COULD eventually vaporize a human being, given they didn't move for a while ( about 1.9 Years, by my back of the napkin math.) Much Longer due to laser ablation, refraction, inefficient energy use and a host of other problems.
So, that's the yard stick.
One of the better examples Zoat gave us describing Mr Kent's Powers in use was back when he was doing some dynamic engineering regarding a flooded river system. We didn't get hard numbers, but he was flying in, melting bedrock with heat vision, hand digging trenches and flying back, all within a few moments as he removed and then caught his JL communicator.
Now either Supes had his eyeballs set to wide beam, or he was melting that tunnel of rock from a single focus point and allowing thermal bloom and heat transfer/ convection to melt the surrounding rock. At the energy levels required to do that in the space of time required....it really doesn't matter anymore, as you've stopped being a Newtonian physics problem and started being a Particle physics problem.
Closest comparison I could make would be Project Plowshare, the US's studies into using nukes for 'peaceful' stuff, like making really big holes in the ground, oil and gas recovery, and generally making the world more radioactive in the process. So...we're in the Kiloton Nuclear bomb territories here. For Superman, we're in Gigawatt range of lasers on the low end.
Easily enough to vaporize a person, and the rest of the crowd, in the blink of an eye.